US20030223837A1 - Tool holder - Google Patents
Tool holder Download PDFInfo
- Publication number
- US20030223837A1 US20030223837A1 US10/147,429 US14742902A US2003223837A1 US 20030223837 A1 US20030223837 A1 US 20030223837A1 US 14742902 A US14742902 A US 14742902A US 2003223837 A1 US2003223837 A1 US 2003223837A1
- Authority
- US
- United States
- Prior art keywords
- tool holder
- holder body
- tapered shank
- tapered
- coupling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008878 coupling Effects 0.000 claims abstract description 65
- 238000010168 coupling process Methods 0.000 claims abstract description 65
- 238000005859 coupling reaction Methods 0.000 claims abstract description 65
- 238000003780 insertion Methods 0.000 claims description 25
- 230000037431 insertion Effects 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 20
- 230000005489 elastic deformation Effects 0.000 abstract description 10
- 230000005484 gravity Effects 0.000 description 7
- 229910000851 Alloy steel Inorganic materials 0.000 description 5
- 229910001240 Maraging steel Inorganic materials 0.000 description 4
- 238000005219 brazing Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 231100000989 no adverse effect Toxicity 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
- B23B29/04—Tool holders for a single cutting tool
- B23B29/12—Special arrangements on tool holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/11—Retention by threaded connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/006—Conical shanks of tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
- B23B2270/06—Use of elastic deformation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/94—Tool-support
- Y10T408/95—Tool-support with tool-retaining means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/309352—Cutter spindle or spindle support
- Y10T409/309408—Cutter spindle or spindle support with cutter holder
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/30952—Milling with cutter holder
Definitions
- the present invention relates to a tool holder which holds various tools and which is mounted on, for example, a machine tool spindle.
- a conventional tool holder includes, for examples, a tool holder body for holding tools and a tapered shank mounted on a machine tool spindle or the like.
- the tapered shank is brought into engagement with a tapered hole in the machine tool spindle.
- the outer surface (outer boundary surface) of the tapered shank has to be brought into close contact with the inner surface (inner boundary surface) of the tapered hole.
- the tool holder is structured in such a manner that in order to realize secured close contact (or engagement) of the tapered shank with the tapered hole, the tapered shank is formed with a hollow and is thus capable of diameter contraction by means of elastic deformation, and the tapered shank, the diameter of which has contracted, has the property of returning to the original state after the engagement with the tapered hole.
- the use of this tapered hollow shank also makes it possible to reduce the weight of the tool holder.
- the tool holder body and the tapered shank are normally composed as separate units, and the tool holder is structured in such a manner that a flange formed at one end (on the side opposite to the tool insertion hole side) of the tool holder and a flange formed at one end (on the tool insertion hole side) of the tapered shank are placed side by side and are then joined with bolts.
- Examples of a tool holder having such a tapered hollow shank include British Patent Publication No. GB2004478A and Japanese Patent Laid-Open (Kokai) Publication No. HEI 7-96436.
- the aim of the-present invention is to improve the above-described conventional tool holder. It is an object of this invention to provide a tool holder which allows a tool holder body to be coupled to a tapered shank even if the outer diameter of the tool holder body is larger than that of a flange of the tapered shank, and which is hardly influenced by centrifugal force generated at the time of high-speed rotation, and which can cause elastic deformation of the tapered shank effectively.
- this invention provides a tool holder comprising: a tapered hollow shank mounted on a machine tool spindle; and a tool holder body coupled to the tapered shank; wherein the tapered shank and the tool holder body are coupled to each other in the state where a part of the tapered shank is inserted into the tool holder body.
- the tapered shank and the tool holder body are coupled to each other in the state where a part of the tapered shank is inserted into the tool holder body, even if the outside diameter of the tool holder body is larger than that of the tapered shank, it is possible to couple the tool holder body to the tapered shank.
- thick flanges or the like which are used in the conventional tool holder and which hardly deform elastically are not used in this invention for the coupling of the tapered shank and the tool holder body, it is possible to effectively cause the elastic deformation of the tapered shank. Therefore, the tapered shank also has a damping effect.
- tapered shank and the tool holder body are securely coupled to each other, even if, for example, centrifugal force generated at high-speed rotation acts on them, such centrifugal force will have no adverse effect on the integrated state of the tapered shank and the tool holder body.
- a coupling part for coupling the tool holder body to the tapered shank can comprise a guiding part for positioning the tool holder body relative to the tapered shank and an attaching part for attaching the tool holder body to the tapered shank.
- the guiding part can be located on the tapered shank insertion side of the tool holder body, and the attaching part can be located at a position on the inner surface of the tool holder body further away from the tapered shank insertion side compared to the guiding part.
- the attaching part can be located at a position at a maximum distance from the part of the tapered shank to be placed in a tapered hole formed in the machine tool spindle. Accordingly, it is possible to cause the elastic deformation of the tapered shank more effectively.
- the attaching part can comprise: a first screw part formed on the inner surface of the tool holder body, and a second screw part formed on the outer surface of the tapered shank for engaging with the first screw part.
- the attaching part may be fixed by means of, for example, welding, brazing, or bonding, to secure the inner surface of the tool holder body and the outer surface of the tapered shank, both of which constitute the attaching part.
- FIG. 1 is a partially sectional view of a tool holder according to Embodiment 1 of this invention.
- FIG. 2 is an enlarged sectional view of a part of the tool holder of FIG. 1 in the vicinity of a coupling part thereof.
- FIG. 3 is a partially sectional view of the tool holder of FIG. 1 in the state where it is attached to a machine tool spindle.
- FIG. 4 is a partially sectional view of a tool holder according to Embodiment 2 of this invention.
- FIG. 1 is a partially sectional view of a tool holder according to Embodiment 1 of this invention.
- FIG. 2 is an enlarged sectional view of a part of the tool holder of FIG. 1 in the vicinity of a coupling part thereof.
- FIG. 3 is a partially sectional view of the tool holder of FIG. 1 in the state where it is attached to a machine tool spindle.
- a tool holder 1 As shown in FIGS. 1 through 3, a tool holder 1 according to Embodiment 1 comprises: a tapered hollow shank 10 mounted on a machine tool spindle 100 ; and a tool holder body 11 coupled to the tapered shank 10 .
- the tapered shank 10 comprises: a tapered part 13 which has an outer surface 12 formed in a tapered shape corresponding to (or complementary to) the inner surface of a tapered hole 101 in the machine tool spindle 100 ; and a coupling part 14 substantially in a cylindrical shape which is integrated with the tapered part 13 on the tool holder body 11 side.
- the outside diameter of the coupling part 14 is slightly smaller than the maximum outside diameter of the tapered part 13 , and the coupling part 14 is inserted into the tool holder body 11 described later.
- a guiding part 15 On the outer surface of the coupling part 14 on its tapered part 13 side is formed a guiding part 15 , while on the outer surface of the coupling part 14 on the tool holder body 11 side and adjacent to the guiding part 15 is formed a screw part 16 as an attaching part.
- the guiding part 15 serves as a guide for coupling the tapered shank 10 to the inside of the tool holder body 11 and also plays a role in centering in order to maintain the concentric arrangement of the tool holder body 11 with the tapered shank 10 . Accordingly, the tool holder body 11 is positioned relative to the tapered shank 10 .
- the screw part 16 is formed so as to engage with a screw part 26 formed on the inner surface of the tool holder body 11 as described later.
- an insertion hole 17 for inserting one end of a pull stud 110 .
- a female screw part 18 for engaging with a male screw part 111 of the pull stud 110 .
- This tapered shank 10 has a hollow 19 inside thereof. This structure enables weight reduction and also makes it possible to cause the diameter contraction of the tapered shank 10 by means of elastic deformation. The tapered shank, the diameter of which has contracted, tends to return to its original state. This action enables the tapered shank 10 to enter into secured close contact (or engagement) with the tapered hole 101 .
- the tapered shank 10 is made of maraging steel.
- the specific gravity of this maraging steel is 8.05.
- a jaw part 21 is formed at one end of the tool holder body 11 on the side into which the tapered shank 10 is inserted.
- a tool not shown in the drawings is held and secured at the tool inserting part of the tool holder body 11 on the side opposite the jaw part 21 .
- On the outer surface of the jaw part 21 is formed a groove 22 to be held by a well-known manipulator.
- engagement concaves 23 evenly spaced at an angle of 180° for engaging with drive keys 102 of the main tool spindle in order to cause the tool holder 1 to rotate in an integrated manner with the machine tool spindle 100 .
- a coupling part 24 to be coupled to the coupling part 14 of the tapered shank 10 .
- a guiding part 25 On the tapered shank 10 side of this coupling part 24 is formed a guiding part 25 .
- a screw part 26 On the tool insertion hole side (further inside of the tool holder body 11 than the position of the guiding part 25 ) of the coupling part 24 and adjacent to the guiding part 25 is formed a screw part 26 for engaging with the screw part 16 .
- the guiding part 25 contacts the guiding part 15 and serves as a guide for coupling the tapered shank 10 to the inside of the tool holder body 11 and also plays a role in centering in order to maintain the concentric arrangement of the tool holder body 11 with the tapered shank 10 .
- the tool holder body 11 is made of alloy steel.
- the specific gravity of this alloy steel is 7.8, which is smaller than the specific gravity of maraging steel which composes the tapered shank 10 .
- the coupling part 14 of the tapered shank 10 is first inserted into the coupling part 24 of the tool holder body 11 to cause the screw part 16 to engage with the screw part 26 .
- the existence of the guiding parts 15 and 25 allows the tool holder body 11 and the tapered shank 10 to move in concert with each other and causes the tool holder body 11 to be placed concentrically with the tapered shank 10 so that the concentric arrangement is maintained. Accordingly, the tool holder body 11 is coupled to the tapered shank 10 securely and with a high degree of precision.
- a contact area between an end face 27 of the tool holder body 11 and the tapered shank 10 may be left as it is or be fixed by means of, for example, welding, brazing, or applying an adhesive.
- the tool holder 1 having the above-described structure is constructed in such a manner that the tool holder body 11 and the tapered shank 10 are coupled to each other in the state where one end (that is, the coupling part 14 ) of the tapered shank 10 on its tool insertion hole side is inserted into the tool holder body 11 . Accordingly, even if the outside diameter of the tool holder body 11 is larger than that of the tapered shank 10 , it is possible to couple the tool holder body 11 to the tapered shank 10 .
- the specific gravity of the material for the tapered shank 10 is larger than that of the material for the tool holder body 11 , even if large centrifugal force is generated at the time of high-speed rotation of the machine tool spindle 100 , it is possible to more securely bring the tapered shank 10 into close contact with the coupling part 24 of the tool holder body 11 and the tapered hole 101 in the machine tool spindle 100 .
- the pull stud 110 is first inserted into the insertion hole 17 formed in the tapered shank 10 and the male screw part 111 formed on the outer surface of the pull stud 110 is caused to engage with the female screw part 18 formed on the inner surface of the insertion hole 17 , thereby securing the pull stud 110 at the tapered shank 10 .
- this pull stud 110 is designed to engage with a pulling member 112 on the machine tool spindle 100 side.
- the tapered shank 10 of the tool holder 1 is inserted into the tapered hole 101 in the machine tool spindle 100 , so that the pulling member 112 engages with the pull stud 110 , thereby causing the tapered shank 10 to be mounted at the machine tool spindle 100 as if the tapered shank 10 is pulled toward the inside of the machine tool spindle 100 .
- the pull stud 110 forces the tapered shank 10 to be pulled toward the inside of the machine tool spindle 100 . Accordingly, the tapered shank 10 is pressed by the inner surface of the tapered hole 101 , thereby deforming elastically and contracting its diameter.
- This diameter contraction enables the tapered shank 10 to move toward the inside of the tapered hole 101 , and the end face 27 of the jaw part 21 contacts the end face 113 of the machine tool spindle 100 and, at the same time, the outer surface 12 of the tapered shank 10 securely contacts the inner surface of the tapered hole 101 .
- Embodiment 1 the case in which the tapered shank 10 is made of maraging steel and the tool holder body 11 is made of alloy steel is explained.
- the tool holder body 11 is made of alloy steel
- examples of material (for the tapered shank 10 ) with greater specific gravity than that of the alloy steel include high-nickel stainless steel.
- a tool holder according to Embodiment 2 of this invention is hereinafter described with reference to the relevant drawing.
- FIG. 4 is a partially sectional view of the tool holder according to Embodiment 2.
- the elements of Embodiment 2 similar to those explained in Embodiment 1 are given the same reference numerals, and any detailed description thereof is omitted.
- a tool holder 2 of Embodiment 2 is different from the tool holder 1 of Embodiment 1 in the structure of coupling parts 34 and 44 .
- the tapered shank 10 comprises a coupling part 34 substantially in a cylindrical shape which is integrated with the tapered part 13 on the tool holder body 11 side.
- the outside diameter of the coupling part 34 is slightly smaller than the maximum outside diameter of the tapered part 13 , and the coupling part 34 is inserted in the tool holder body 11 in the same manner as in Embodiment 1.
- On the outer surface of the coupling part 34 on the tapered part 13 side is formed a guiding part 35 , while on the outer surface of the coupling part 34 on the tool holder body 11 side and adjacent to the guiding part 35 is formed an attaching part 36 .
- a coupling part 44 to be coupled to the coupling part 34 of the tapered shank 10 .
- a guiding part 45 On the tapered shank 10 side of this coupling part 44 is formed a guiding part 45 .
- an attaching part 46 On the tool insertion hole side (further inside of the tool holder body 11 than the position of the guiding part 45 ) of the coupling part 44 and adjacent to the guiding part 45 is formed an attaching part 46 .
- the coupling part 34 of the tapered shank 10 is first inserted into the coupling part 44 of the tool holder body 11 , and the coupling parts 34 and 44 are fixed by means of welding, brazing, or bonding with an adhesive.
- the existence of the guiding parts 35 and 45 allows the tool holder body 11 and the tapered shank 10 to move in concert with each other and causes the tool holder body 11 to be placed concentrically with the tapered shank 10 so that the concentric arrangement is maintained. Accordingly, the tool holder body 11 is coupled to the tapered shank 10 securely and with a high degree of precision.
- the coupling part 34 is fixed at a position on the tool holder body 11 side, that is, at a maximum distance from the machine tool spindle 100 side (see FIG. 3). This enables the tapered shank 10 to more easily contract its diameter by means of elastic deformation.
- the tool holder of this invention is structured in such a manner that the tapered shank and the tool holder body are coupled to each other in the state where a part of the tapered shank is inserted in the tool holder body. Accordingly, the tool holder body can be coupled to the tapered shank regardless of the size of the outside diameter of the tool holder body. Since the tool holder body and the tapered shank are formed as separate units, it is possible to use optimal materials for the tapered shank and the tool holder body respectively. Moreover, since it is possible to cause the elastic deformation of the tapered shank effectively, it is possible to securely attach the tool holder to the machine tool spindle.
- tapered shank and the tool holder body are coupled securely to each other, for example, even if centrifugal force generated by high-speed rotation acts on them, such centrifugal force will have no adverse effect on the integrated state of the tapered shank and the tool holder body, thereby enabling excellent coupling.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a tool holder which holds various tools and which is mounted on, for example, a machine tool spindle.
- 2. Description of the Related Art
- A conventional tool holder includes, for examples, a tool holder body for holding tools and a tapered shank mounted on a machine tool spindle or the like. When this tool holder is mounted on the machine tool spindle or the like, the tapered shank is brought into engagement with a tapered hole in the machine tool spindle. At this time, the outer surface (outer boundary surface) of the tapered shank has to be brought into close contact with the inner surface (inner boundary surface) of the tapered hole. Accordingly, the tool holder is structured in such a manner that in order to realize secured close contact (or engagement) of the tapered shank with the tapered hole, the tapered shank is formed with a hollow and is thus capable of diameter contraction by means of elastic deformation, and the tapered shank, the diameter of which has contracted, has the property of returning to the original state after the engagement with the tapered hole. The use of this tapered hollow shank also makes it possible to reduce the weight of the tool holder.
- Concerning the conventional tool holder having such a tapered hollow shank, the tool holder body and the tapered shank are normally composed as separate units, and the tool holder is structured in such a manner that a flange formed at one end (on the side opposite to the tool insertion hole side) of the tool holder and a flange formed at one end (on the tool insertion hole side) of the tapered shank are placed side by side and are then joined with bolts.
- Examples of a tool holder having such a tapered hollow shank include British Patent Publication No. GB2004478A and Japanese Patent Laid-Open (Kokai) Publication No. HEI 7-96436.
- However, since the flanges of the conventional tool holder having the above-described tapered hollow shank are secured by using bolts, if the outside diameter of the tool holder body is larger than that of the tapered shank, it is difficult to place the flanges side by side and it is impossible to join them together.
- Moreover, even if the tapered hollow shank can deform elastically, it is difficult to cause the flange to do this, thereby resulting in difficulty in causing optimal elastic deformation of the tapered shank. Accordingly, there is a possibility that it may become difficult to bring the tapered shank into secured close contact (or engagement) with the tapered hole in the machine tool spindle. Therefore, it is sometimes necessary to notch the tapered hole of the machine tool spindle or to notch the flange of the tapered shank.
- The aim of the-present invention is to improve the above-described conventional tool holder. It is an object of this invention to provide a tool holder which allows a tool holder body to be coupled to a tapered shank even if the outer diameter of the tool holder body is larger than that of a flange of the tapered shank, and which is hardly influenced by centrifugal force generated at the time of high-speed rotation, and which can cause elastic deformation of the tapered shank effectively.
- In order to achieve this object, this invention provides a tool holder comprising: a tapered hollow shank mounted on a machine tool spindle; and a tool holder body coupled to the tapered shank; wherein the tapered shank and the tool holder body are coupled to each other in the state where a part of the tapered shank is inserted into the tool holder body.
- Since in the tool holder having the above-described structure the tapered shank and the tool holder body are coupled to each other in the state where a part of the tapered shank is inserted into the tool holder body, even if the outside diameter of the tool holder body is larger than that of the tapered shank, it is possible to couple the tool holder body to the tapered shank. Moreover, since thick flanges or the like which are used in the conventional tool holder and which hardly deform elastically are not used in this invention for the coupling of the tapered shank and the tool holder body, it is possible to effectively cause the elastic deformation of the tapered shank. Therefore, the tapered shank also has a damping effect. Furthermore, since the tapered shank and the tool holder body are securely coupled to each other, even if, for example, centrifugal force generated at high-speed rotation acts on them, such centrifugal force will have no adverse effect on the integrated state of the tapered shank and the tool holder body.
- A coupling part for coupling the tool holder body to the tapered shank can comprise a guiding part for positioning the tool holder body relative to the tapered shank and an attaching part for attaching the tool holder body to the tapered shank.
- The guiding part can be located on the tapered shank insertion side of the tool holder body, and the attaching part can be located at a position on the inner surface of the tool holder body further away from the tapered shank insertion side compared to the guiding part. With this structure, the attaching part can be located at a position at a maximum distance from the part of the tapered shank to be placed in a tapered hole formed in the machine tool spindle. Accordingly, it is possible to cause the elastic deformation of the tapered shank more effectively.
- The attaching part can comprise: a first screw part formed on the inner surface of the tool holder body, and a second screw part formed on the outer surface of the tapered shank for engaging with the first screw part.
- Moreover, the attaching part may be fixed by means of, for example, welding, brazing, or bonding, to secure the inner surface of the tool holder body and the outer surface of the tapered shank, both of which constitute the attaching part.
- It is possible to construct the tool holder by using different materials for the tapered shank and for the tool holder body. This makes it possible to bring the tapered shank into close contact with the tapered hole in the machine tool spindle with further certainty even if great centrifugal force is generated at the time of high-speed rotation of the machine tool spindle.
- Furthermore, it is possible to employ the setting so that the specific gravity of the material for the tapered shank is greater than that of the material for the tool holder body.
- By forming the tool holder body and the tapered shank as separate units, it is possible to manufacture them respectively by using optimal materials.
- FIG. 1 is a partially sectional view of a tool holder according to
Embodiment 1 of this invention. - FIG. 2 is an enlarged sectional view of a part of the tool holder of FIG. 1 in the vicinity of a coupling part thereof.
- FIG. 3 is a partially sectional view of the tool holder of FIG. 1 in the state where it is attached to a machine tool spindle.
- FIG. 4 is a partially sectional view of a tool holder according to
Embodiment 2 of this invention. - Tool holders according to embodiments of the present invention are hereinafter described with reference to the attached drawings.
- (Embodiment 1)
- FIG. 1 is a partially sectional view of a tool holder according to
Embodiment 1 of this invention. FIG. 2 is an enlarged sectional view of a part of the tool holder of FIG. 1 in the vicinity of a coupling part thereof. FIG. 3 is a partially sectional view of the tool holder of FIG. 1 in the state where it is attached to a machine tool spindle. - As shown in FIGS. 1 through 3, a
tool holder 1 according toEmbodiment 1 comprises: a taperedhollow shank 10 mounted on amachine tool spindle 100; and atool holder body 11 coupled to thetapered shank 10. - The
tapered shank 10 comprises: atapered part 13 which has anouter surface 12 formed in a tapered shape corresponding to (or complementary to) the inner surface of atapered hole 101 in themachine tool spindle 100; and acoupling part 14 substantially in a cylindrical shape which is integrated with thetapered part 13 on thetool holder body 11 side. - The outside diameter of the
coupling part 14 is slightly smaller than the maximum outside diameter of thetapered part 13, and thecoupling part 14 is inserted into thetool holder body 11 described later. On the outer surface of thecoupling part 14 on itstapered part 13 side is formed aguiding part 15, while on the outer surface of thecoupling part 14 on thetool holder body 11 side and adjacent to theguiding part 15 is formed ascrew part 16 as an attaching part. The guidingpart 15 serves as a guide for coupling thetapered shank 10 to the inside of thetool holder body 11 and also plays a role in centering in order to maintain the concentric arrangement of thetool holder body 11 with thetapered shank 10. Accordingly, thetool holder body 11 is positioned relative to thetapered shank 10. Moreover, thescrew part 16 is formed so as to engage with ascrew part 26 formed on the inner surface of thetool holder body 11 as described later. - On the
machine tool spindle 100 side of thetapered shank 10 is formed aninsertion hole 17 for inserting one end of apull stud 110. On the inner surface of theinsertion hole 17 is formed afemale screw part 18 for engaging with amale screw part 111 of thepull stud 110. - This
tapered shank 10 has a hollow 19 inside thereof. This structure enables weight reduction and also makes it possible to cause the diameter contraction of thetapered shank 10 by means of elastic deformation. The tapered shank, the diameter of which has contracted, tends to return to its original state. This action enables thetapered shank 10 to enter into secured close contact (or engagement) with thetapered hole 101. - In
Embodiment 1, thetapered shank 10 is made of maraging steel. The specific gravity of this maraging steel is 8.05. - At one end of the
tool holder body 11 on the side into which thetapered shank 10 is inserted, ajaw part 21 is formed. A tool not shown in the drawings is held and secured at the tool inserting part of thetool holder body 11 on the side opposite thejaw part 21. On the outer surface of thejaw part 21 is formed agroove 22 to be held by a well-known manipulator. Around the circumference of thejaw part 21 are formedengagement concaves 23 evenly spaced at an angle of 180° for engaging withdrive keys 102 of the main tool spindle in order to cause thetool holder 1 to rotate in an integrated manner with themachine tool spindle 100. On the inner surface of thejaw part 21 is formed acoupling part 24 to be coupled to thecoupling part 14 of the taperedshank 10. On the taperedshank 10 side of thiscoupling part 24 is formed a guidingpart 25. On the tool insertion hole side (further inside of thetool holder body 11 than the position of the guiding part 25) of thecoupling part 24 and adjacent to the guidingpart 25 is formed ascrew part 26 for engaging with thescrew part 16. - The guiding
part 25 contacts the guidingpart 15 and serves as a guide for coupling the taperedshank 10 to the inside of thetool holder body 11 and also plays a role in centering in order to maintain the concentric arrangement of thetool holder body 11 with the taperedshank 10. - In
Embodiment 1, thetool holder body 11 is made of alloy steel. The specific gravity of this alloy steel is 7.8, which is smaller than the specific gravity of maraging steel which composes the taperedshank 10. - In order to assemble the
tool holder 1 having the above-described components, thecoupling part 14 of the taperedshank 10 is first inserted into thecoupling part 24 of thetool holder body 11 to cause thescrew part 16 to engage with thescrew part 26. At this time, the existence of the guidingparts tool holder body 11 and the taperedshank 10 to move in concert with each other and causes thetool holder body 11 to be placed concentrically with the taperedshank 10 so that the concentric arrangement is maintained. Accordingly, thetool holder body 11 is coupled to the taperedshank 10 securely and with a high degree of precision. Regarding this coupling, it is possible to fix thescrew parts screw parts shank 10 and thetool holder body 11 couple to each other more firmly. - A contact area between an
end face 27 of thetool holder body 11 and the taperedshank 10 may be left as it is or be fixed by means of, for example, welding, brazing, or applying an adhesive. - The
tool holder 1 having the above-described structure is constructed in such a manner that thetool holder body 11 and the taperedshank 10 are coupled to each other in the state where one end (that is, the coupling part 14) of the taperedshank 10 on its tool insertion hole side is inserted into thetool holder body 11. Accordingly, even if the outside diameter of thetool holder body 11 is larger than that of the taperedshank 10, it is possible to couple thetool holder body 11 to the taperedshank 10. - Since no thick member (such as a flange) which hardly deforms elastically is used at the time of coupling of the
tool holder body 11 to the taperedshank 10, it is possible to cause the elastic deformation of the taperedshank 10 effectively. - Moreover, since the tapered
shank 10 and thetool holder body 11 are securely coupled to each other, for example, even if centrifugal force generated at high-speed rotation acts on them, such centrifugal force will have no adverse effect on the integrated state of the taperedshank 10 and thetool holder body 11. - Furthermore, since the specific gravity of the material for the tapered
shank 10 is larger than that of the material for thetool holder body 11, even if large centrifugal force is generated at the time of high-speed rotation of themachine tool spindle 100, it is possible to more securely bring the taperedshank 10 into close contact with thecoupling part 24 of thetool holder body 11 and thetapered hole 101 in themachine tool spindle 100. - In order to attach the
tool holder 1 to themachine tool spindle 100, thepull stud 110 is first inserted into theinsertion hole 17 formed in the taperedshank 10 and themale screw part 111 formed on the outer surface of thepull stud 110 is caused to engage with thefemale screw part 18 formed on the inner surface of theinsertion hole 17, thereby securing thepull stud 110 at the taperedshank 10. As indicated by alternate long and short dashed lines in FIG. 3, thispull stud 110 is designed to engage with a pullingmember 112 on themachine tool spindle 100 side. - As the
groove 22 in thetool holder body 11 is held by a manipulator not shown in the drawings, the taperedshank 10 of thetool holder 1 is inserted into thetapered hole 101 in themachine tool spindle 100, so that the pullingmember 112 engages with thepull stud 110, thereby causing the taperedshank 10 to be mounted at themachine tool spindle 100 as if the taperedshank 10 is pulled toward the inside of themachine tool spindle 100. This causes theend face 27 of thejaw part 21 on themachine tool spindle 100 side to contact theend face 113 of themachine tool spindle 100 and also causes theouter surface 12 of the taperedshank 10 to contact the inner surface of the taperedhole 101 in themachine tool spindle 100, thereby causing thetool holder 1 to be firmly attached to themachine tool spindle 100 by means of simultaneous dual contact. - At this time, for example, even if a gap is created between the
end face 27 and theend face 113 as theouter surface 12 of the taperedshank 10 contacts the inner surface of the taperedhole 101 in themachine tool spindle 100 before theend face 27 of thejaw part 27 contacts theend face 113 of themachine tool spindle 100 because of machining inaccuracy in the manufacturing process, thepull stud 110 forces the taperedshank 10 to be pulled toward the inside of themachine tool spindle 100. Accordingly, the taperedshank 10 is pressed by the inner surface of the taperedhole 101, thereby deforming elastically and contracting its diameter. This diameter contraction enables the taperedshank 10 to move toward the inside of the taperedhole 101, and theend face 27 of thejaw part 21 contacts theend face 113 of themachine tool spindle 100 and, at the same time, theouter surface 12 of the taperedshank 10 securely contacts the inner surface of the taperedhole 101. - In
Embodiment 1, the case in which the taperedshank 10 is made of maraging steel and thetool holder body 11 is made of alloy steel is explained. However, without limitation to such example, if thetool holder body 11 is made of alloy steel, examples of material (for the tapered shank 10) with greater specific gravity than that of the alloy steel include high-nickel stainless steel. - Although it is a desired condition that the specific gravity of the material for the tapered
shank 10 be greater than that of the material for thetool holder body 11, it is not an essential condition for the present invention. - (Embodiment 2)
- A tool holder according to
Embodiment 2 of this invention is hereinafter described with reference to the relevant drawing. - FIG. 4 is a partially sectional view of the tool holder according to
Embodiment 2. The elements ofEmbodiment 2 similar to those explained inEmbodiment 1 are given the same reference numerals, and any detailed description thereof is omitted. - As shown in FIG. 4, a
tool holder 2 ofEmbodiment 2 is different from thetool holder 1 ofEmbodiment 1 in the structure ofcoupling parts - The tapered
shank 10 comprises acoupling part 34 substantially in a cylindrical shape which is integrated with thetapered part 13 on thetool holder body 11 side. The outside diameter of thecoupling part 34 is slightly smaller than the maximum outside diameter of thetapered part 13, and thecoupling part 34 is inserted in thetool holder body 11 in the same manner as inEmbodiment 1. On the outer surface of thecoupling part 34 on thetapered part 13 side is formed a guidingpart 35, while on the outer surface of thecoupling part 34 on thetool holder body 11 side and adjacent to the guidingpart 35 is formed an attachingpart 36. - On the inner surface of the
jaw part 21 of thetool holder body 11 is formed acoupling part 44 to be coupled to thecoupling part 34 of the taperedshank 10. On the taperedshank 10 side of thiscoupling part 44 is formed a guidingpart 45. On the tool insertion hole side (further inside of thetool holder body 11 than the position of the guiding part 45) of thecoupling part 44 and adjacent to the guidingpart 45 is formed an attachingpart 46. - In order to assemble the
tool holder 2 having the above-described components, thecoupling part 34 of the taperedshank 10 is first inserted into thecoupling part 44 of thetool holder body 11, and thecoupling parts Embodiment 1, the existence of the guidingparts tool holder body 11 and the taperedshank 10 to move in concert with each other and causes thetool holder body 11 to be placed concentrically with the taperedshank 10 so that the concentric arrangement is maintained. Accordingly, thetool holder body 11 is coupled to the taperedshank 10 securely and with a high degree of precision. - Regarding this coupling, it is desirable that the
coupling part 34 is fixed at a position on thetool holder body 11 side, that is, at a maximum distance from themachine tool spindle 100 side (see FIG. 3). This enables the taperedshank 10 to more easily contract its diameter by means of elastic deformation. - As described above, the tool holder of this invention is structured in such a manner that the tapered shank and the tool holder body are coupled to each other in the state where a part of the tapered shank is inserted in the tool holder body. Accordingly, the tool holder body can be coupled to the tapered shank regardless of the size of the outside diameter of the tool holder body. Since the tool holder body and the tapered shank are formed as separate units, it is possible to use optimal materials for the tapered shank and the tool holder body respectively. Moreover, since it is possible to cause the elastic deformation of the tapered shank effectively, it is possible to securely attach the tool holder to the machine tool spindle. Furthermore, since the tapered shank and the tool holder body are coupled securely to each other, for example, even if centrifugal force generated by high-speed rotation acts on them, such centrifugal force will have no adverse effect on the integrated state of the tapered shank and the tool holder body, thereby enabling excellent coupling.
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001336797A JP2003136354A (en) | 2001-11-01 | 2001-11-01 | Tool holder |
JP2001-336797 | 2001-11-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20030223837A1 true US20030223837A1 (en) | 2003-12-04 |
US6739810B2 US6739810B2 (en) | 2004-05-25 |
Family
ID=19151560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/147,429 Expired - Fee Related US6739810B2 (en) | 2001-11-01 | 2002-05-16 | Tool holder |
Country Status (6)
Country | Link |
---|---|
US (1) | US6739810B2 (en) |
EP (1) | EP1308229A1 (en) |
JP (1) | JP2003136354A (en) |
KR (1) | KR20030038317A (en) |
CN (1) | CN1416989A (en) |
TW (1) | TW579317B (en) |
Cited By (1)
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US20060013665A1 (en) * | 2004-07-13 | 2006-01-19 | Ford Motor Company | Tool holder assembly |
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JP4475899B2 (en) * | 2003-08-29 | 2010-06-09 | 大昭和精機株式会社 | Tool holder |
US20060064869A1 (en) * | 2004-09-27 | 2006-03-30 | Shipper Terry J | Tool holder |
DE102004054550A1 (en) * | 2004-11-11 | 2006-05-18 | Franz Haimer Maschinenbau Kg | Vibration-damped tool holder |
TWM284482U (en) * | 2005-09-13 | 2006-01-01 | Primetool Mfg Inc | Tool holding structure |
US20070098512A1 (en) * | 2005-11-02 | 2007-05-03 | Peter Chen | Clamping device for a tool |
US7186064B1 (en) | 2005-12-14 | 2007-03-06 | Kennametal Inc. | Rotary tapered tool holder with adapter sleeve |
ITAR20070002U1 (en) * | 2007-02-22 | 2007-05-24 | It Te Di S R L | TOOL HOLDER COUPLING FOR TOOL MACHINES |
TWM350431U (en) * | 2008-09-03 | 2009-02-11 | Syntec Machinery Co Ltd | Adjustable securely-mounted tool bar of spindle |
DE102009006010A1 (en) * | 2009-01-23 | 2010-07-29 | Kennametal Inc. | Device for attaching an annular Fräswerkzeugträgers |
CH702285B1 (en) * | 2009-11-30 | 2013-06-14 | Rego Fix Ag | Toolholder system. |
DE102010004526B4 (en) * | 2010-01-14 | 2014-05-22 | Kennametal Inc. | cutting tool |
CN101966655B (en) * | 2010-08-31 | 2015-04-22 | 哈尔滨量具刃具集团有限责任公司 | Fixture for multifunctional processing center for processing 7:24 taper-shank tool system |
EP2698672A4 (en) | 2011-04-01 | 2014-09-10 | Samsung Fine Chemicals Co Ltd | Method for manufacturing eco-friendly toner |
DE102011116080B3 (en) * | 2011-10-10 | 2013-01-31 | Hartmetall-Werkzeugfabrik Paul Horn Gmbh | Tool system for machining a workpiece |
CN102490055A (en) * | 2011-11-18 | 2012-06-13 | 江苏大学 | Self-adaptive high-speed tool handle |
JP5456112B2 (en) * | 2012-08-08 | 2014-03-26 | 株式会社日研工作所 | Tool holder and tool holder mounting structure |
FR2997328B1 (en) * | 2012-10-25 | 2015-05-15 | Seco Epb | TIGHTENING AND FASTENING ASSEMBLY OF MALE AND FEMALE PIECES EMMANCHEES |
JP2015039753A (en) * | 2013-08-23 | 2015-03-02 | 株式会社日研工作所 | Hydraulic pressure chuck structure, and method of manufacturing the same |
EP3492221B1 (en) * | 2016-07-28 | 2021-04-28 | Big Daishowa Co., Ltd. | Misalignment-measuring device |
CN106670522B (en) * | 2017-01-18 | 2018-12-07 | 燕山大学 | A kind of High-speed Tool Shank compensating centrifugation expansion using liquid plastics |
DE102017121363A1 (en) * | 2017-09-14 | 2019-03-14 | Franz Haimer Maschinenbau Kg | Threaded insert for mounting a tool in a tool holder and tool holder with such a threaded insert |
CN107932149A (en) * | 2017-11-15 | 2018-04-20 | 广州市昊志机电股份有限公司 | A kind of lathe handle of a knife |
CN109014263B (en) * | 2018-08-15 | 2020-04-21 | 东方电气集团东方汽轮机有限公司 | Adjustable over-positioning knife handle and adjusting method thereof |
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2002
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- 2002-05-22 KR KR1020020028348A patent/KR20030038317A/en not_active Application Discontinuation
- 2002-05-27 EP EP02253694A patent/EP1308229A1/en not_active Withdrawn
- 2002-05-28 CN CN02121948A patent/CN1416989A/en active Pending
- 2002-05-30 TW TW091111636A patent/TW579317B/en not_active IP Right Cessation
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US6224303B1 (en) * | 1998-07-22 | 2001-05-01 | Black & Decker Inc. | Removable tool holder |
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US20060013665A1 (en) * | 2004-07-13 | 2006-01-19 | Ford Motor Company | Tool holder assembly |
US7160067B2 (en) | 2004-07-13 | 2007-01-09 | Ford Motor Company | Tool holder assembly |
Also Published As
Publication number | Publication date |
---|---|
EP1308229A1 (en) | 2003-05-07 |
JP2003136354A (en) | 2003-05-14 |
TW579317B (en) | 2004-03-11 |
US6739810B2 (en) | 2004-05-25 |
CN1416989A (en) | 2003-05-14 |
KR20030038317A (en) | 2003-05-16 |
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